24 - 02 - 00
Page - 24 - 05
Reissued: August 1, 1986
1I4
CHART 2401. TROUBLESHOOTING (ALTERNATOR) (cont)
Field circuit breaker trips. Short circuit in field winding Disconnect field wiring at
(cont.) of alternator. terminal of alternator. Turn
on master switch. Reset
breaker and if breaker fails
to retrip, this isolates short
circuit to field of alternator
itself. Check brush holders
for shorting against frame. If
there are no obvious signs of
a physical short circuit at field
terminal or brush holder, re
place alternator. (Note: Inter
mittent short circuit.)
—WARNING—
Turn magneto switch to OFF
before turning propeller.
Internal short circuiting of
the field can occur at various
positions of the rotor, there
fore, reconnect field reset
breaker, pull propeller slowly
by hand turning alternator
rotor through 360° of travel.
Observe circuit breaker for
signs of tripping.
Ammeter indicates 60 amps Short to ground in alterna- Check condition of teflon
at l400 rpm and above, tor output wiring. insulators on feet of diode
ALT annunciator light on. heat sink. When the mount
ing screws are overtorqued,
they can cut through insula-
tors causing a short-to-
ground. Check other wiring
for chafing, etc.
Battery installed with re- Battery charged backwards. Remove battery and reinstall
versed polarity. with correct polarity.
Trouble Cause Remedy
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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